Where is nerve tissue present?

Nerve tissue is present throughout the human body. It is in the form of threads that run along the skin. The main function is to take tests for external irritations. The center of the nervous system is the brain. Sometimes it happens that the human nervous system does not work properly and the person feels pain without stimulus. Sometimes the nervous system does not work well and such people should be very careful and visit a doctor periodically. Since they may not feel pain, they may damage their tissues and be unaware of it.